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      GZip 压缩字符串Java实践
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        <h2 id="测试代码">测试代码</h2><a id="more"></a>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span 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class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.bqteam.aurthur;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.io.ByteArrayInputStream;</span><br><span class="line"><span class="keyword">import</span> java.io.ByteArrayOutputStream;</span><br><span class="line"><span class="keyword">import</span> java.io.InputStream;</span><br><span class="line"><span class="keyword">import</span> java.io.OutputStream;</span><br><span class="line"><span class="keyword">import</span> java.util.zip.GZIPInputStream;</span><br><span class="line"><span class="keyword">import</span> java.util.zip.GZIPOutputStream;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">StringGZip</span> </span>&#123;</span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">		StringBuilder value = <span class="keyword">new</span> StringBuilder() ;</span><br><span class="line">		<span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i &lt; <span class="number">1000</span>; i++) &#123;</span><br><span class="line">			value.append(<span class="string">"BQteam String Java 压缩测试"</span>);</span><br><span class="line">		&#125;</span><br><span class="line">		<span class="comment">//字符串压缩为byte数组</span></span><br><span class="line">		<span class="keyword">byte</span>[] values = value.toString().getBytes() ;</span><br><span class="line">		System.out.println(<span class="string">"解压前大小"</span>+values.length);</span><br><span class="line">		values = compress(values) ;</span><br><span class="line">		System.out.println(<span class="string">"解压后大小"</span>+values.length);</span><br><span class="line">		<span class="comment">//把压缩后的byte数组转为字符串</span></span><br><span class="line">		String str = <span class="keyword">new</span> String(values,<span class="string">"iso8859-1"</span>) ;</span><br><span class="line"></span><br><span class="line">		<span class="comment">//做一些数据操作（演示输出）</span></span><br><span class="line">		System.out.println(str);</span><br><span class="line"></span><br><span class="line">		<span class="comment">//将接受到的字符串转换为byte数组</span></span><br><span class="line">		values = str.getBytes(<span class="string">"iso8859-1"</span>) ;</span><br><span class="line"></span><br><span class="line">		<span class="comment">//解压缩这个byte数组</span></span><br><span class="line">		values = decompress(values) ;</span><br><span class="line">		System.out.println(<span class="keyword">new</span> String(values, <span class="string">"utf-8"</span>));</span><br><span class="line"></span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	 <span class="comment">/**</span><br><span class="line">     * 数据解压缩</span><br><span class="line">     *  </span><br><span class="line">     * <span class="doctag">@param</span> data</span><br><span class="line">     * <span class="doctag">@return</span></span><br><span class="line">     * <span class="doctag">@throws</span> Exception</span><br><span class="line">     */</span>  </span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">byte</span>[] decompress(<span class="keyword">byte</span>[] data) <span class="keyword">throws</span> Exception &#123;  </span><br><span class="line">        ByteArrayInputStream bais = <span class="keyword">new</span> ByteArrayInputStream(data);  </span><br><span class="line">        ByteArrayOutputStream baos = <span class="keyword">new</span> ByteArrayOutputStream();  </span><br><span class="line"></span><br><span class="line">        <span class="comment">// 解压缩  </span></span><br><span class="line">        decompress(bais, baos);  </span><br><span class="line">        data = baos.toByteArray();  </span><br><span class="line">        baos.flush();  </span><br><span class="line">        baos.close();  </span><br><span class="line">        bais.close();  </span><br><span class="line">        <span class="keyword">return</span> data;  </span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span><br><span class="line">     * 数据解压缩</span><br><span class="line">     *  </span><br><span class="line">     * <span class="doctag">@param</span> is</span><br><span class="line">     * <span class="doctag">@param</span> os</span><br><span class="line">     * <span class="doctag">@throws</span> Exception</span><br><span class="line">     */</span>  </span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">decompress</span><span class="params">(InputStream is, OutputStream os)</span>  </span><br><span class="line">            <span class="keyword">throws</span> Exception </span>&#123;  </span><br><span class="line"></span><br><span class="line">        GZIPInputStream gis = <span class="keyword">new</span> GZIPInputStream(is);  </span><br><span class="line"></span><br><span class="line">        <span class="keyword">int</span> count;  </span><br><span class="line">        <span class="keyword">byte</span> data[] = <span class="keyword">new</span> <span class="keyword">byte</span>[BUFFER];  </span><br><span class="line">        <span class="keyword">while</span> ((count = gis.read(data, <span class="number">0</span>, BUFFER)) != -<span class="number">1</span>) &#123;  </span><br><span class="line">            os.write(data, <span class="number">0</span>, count);  </span><br><span class="line">        &#125;  </span><br><span class="line"></span><br><span class="line">        gis.close();  </span><br><span class="line">    &#125;  </span><br><span class="line"></span><br><span class="line">	<span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">byte</span>[] compress(<span class="keyword">byte</span>[] data) <span class="keyword">throws</span> Exception &#123;</span><br><span class="line">		ByteArrayInputStream bais = <span class="keyword">new</span> ByteArrayInputStream(data);</span><br><span class="line">		ByteArrayOutputStream baos = <span class="keyword">new</span> ByteArrayOutputStream();</span><br><span class="line"></span><br><span class="line">		<span class="comment">// 压缩</span></span><br><span class="line">		compress(bais, baos);</span><br><span class="line">		<span class="keyword">byte</span>[] output = baos.toByteArray();</span><br><span class="line">		baos.flush();</span><br><span class="line">		baos.close();</span><br><span class="line">		bais.close();</span><br><span class="line">		<span class="keyword">return</span> output;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> BUFFER = <span class="number">10240</span> ;</span><br><span class="line"></span><br><span class="line">	<span class="comment">/**</span><br><span class="line">	 * 数据压缩</span><br><span class="line">	 *</span><br><span class="line">	 * <span class="doctag">@param</span> is</span><br><span class="line">	 * <span class="doctag">@param</span> os</span><br><span class="line">	 * <span class="doctag">@throws</span> Exception</span><br><span class="line">	 */</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">compress</span><span class="params">(InputStream is, OutputStream os)</span></span><br><span class="line">			<span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line"></span><br><span class="line">		GZIPOutputStream gos = <span class="keyword">new</span> GZIPOutputStream(os);</span><br><span class="line"></span><br><span class="line">		<span class="keyword">int</span> count;</span><br><span class="line">		<span class="keyword">byte</span> data[] = <span class="keyword">new</span> <span class="keyword">byte</span>[BUFFER];</span><br><span class="line">		<span class="keyword">while</span> ((count = is.read(data, <span class="number">0</span>, BUFFER)) != -<span class="number">1</span>) &#123;</span><br><span class="line">			gos.write(data, <span class="number">0</span>, count);</span><br><span class="line">		&#125;</span><br><span class="line">		gos.finish();</span><br><span class="line">		gos.flush();</span><br><span class="line">		gos.close();</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

      
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